CN101708430A - Ammonia spraying and mixing system for coal-fired flue gas SCR denitration technology - Google Patents
Ammonia spraying and mixing system for coal-fired flue gas SCR denitration technology Download PDFInfo
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- CN101708430A CN101708430A CN200910153847A CN200910153847A CN101708430A CN 101708430 A CN101708430 A CN 101708430A CN 200910153847 A CN200910153847 A CN 200910153847A CN 200910153847 A CN200910153847 A CN 200910153847A CN 101708430 A CN101708430 A CN 101708430A
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Abstract
The invention discloses an ammonia spraying and mixing system for the coal-fired flue gas SCR denitration technology and relates to a system used for spraying reducing agent ammonia and strengthening the mixture of ammonia and flue gas. The ammonia spraying and mixing system comprises 5-20 reducing agent ammonia jet tubes with independent flow control systems and longitudinal vortex generation elements, wherein the tail end of each reducing agent ammonia jet tube is provided with a two-way nozzle which is vertical and symmetric to the flue gas stream, each longitudinal vortex generation element is a triangle, a trapezoid, a half round or a half ellipse, each longitudinal vortex generation element is connected with the flue wall and forms 30-60 degrees angle with the flue gas stream so as to form longitudinal vortex of which downstream is stable, increase the intensity of turbulent flow and enhance the mixture of reducing agent ammonia and glue gas. The device has the following advantages: 1) the stable longitudinal vortex is formed, the mixing intensity of vortex is increased, and the mixing effect of ammonia and nitrogen is optimized; 2) the number of the ammonia jet tubes is reduced, the ammonia-spraying regulation difficulty is lowered; and 3) pressure breakdown caused by the system is relatively small and the energy loss is reduced.
Description
Technical field
The present invention relates to green technology, relate in particular to a kind of ammonia spraying and mixing system of coal-fired flue gas SCR denitration technology.
Background technology
In current society, the discharging of nitrogen oxide can bring depletion of the ozone layer, a series of problems such as acid rain and the formation of atmosphere flue dust, and then the mankind healthy caused serious harm.From world wide, the fuel combustion especially nitrogen oxide of fired coal combustion generation is one of main source of nitrogen oxide in the atmosphere.In numerous denitration technologies, selective catalytic reduction (SCR) denitration technology is simple with its apparatus structure, no byproduct, operation make things convenient for, plurality of advantages such as reliability is high, denitration efficiency height, has obtained the wide range of commercial utilization.Its cardinal principle is to spray into reducing agent ammonia in 280 ℃～420 ℃ the flue gas and mix with it, under the effect of catalyst, the nitrogen oxide in the flue gas is reduced into the nitrogen G﹠W.Wherein the even mixing of reducing agent ammonia and nitrogen oxide and and flue gas flow field to distribute be one of key factor that influences denitration efficiency.At present in the commerce utilization, what generally adopt is with the method for grid form as ammonia-gas spraying device, the ammonia-spraying grid method adopts the multi-point injection subregion to regulate, because its reducing agent amonia adjutage and nozzle hole number are bigger, thereby make that its adjusting difficulty in actual motion is quite big, often shorten the static mixer that mixes distance and must install additional has also increased system pressure drop and can not reduce ammonia injection in service when having increased installation cost adjusting difficulty in order to improve mixed effect.The inventor is based upon on the basis of being engaged in flue gas desulfurization and denitrification research for a long time, adopt a kind of technique device, realized being used for coal-fired flue gas SCR denitration technology simple in structure, control flexibly, resistance is little and can effectively add strong reductant ammonia sprays the ammonia mixing arrangement with mixing of flue gas.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of ammonia spraying and mixing system that is used for coal-fired flue gas SCR denitration technology is provided.
The ammonia spraying and mixing system that is used for coal-fired flue gas SCR denitration technology comprises flue, the reducing agent amonia adjutage, long direction eddy generator, two-way nozzle, in flue, be provided with by 5～20 reducing agent amonia adjutages, the end of every reducing agent amonia adjutage is provided with two-way nozzle, the flue wall of the upstream and downstream of two-way nozzle is provided with long direction eddy generator, long direction eddy generator is to constitute by being fixed on vertical whirlpool generating device group that two on flue two walls rows arranges symmetrically, the vertical whirlpool of every row generating device group is made up of a plurality of vertical whirlpools generating device, and each vertical whirlpool generating device becomes 30 °～60 ° angles with flue gas flow direction.
Every reducing agent amonia adjutage has independent flow control system.
Vertically the whirlpool generating device is shaped as triangle, trapezoidal, semicircle or half elliptic.
The ammonia spraying and mixing system that is used for coal-fired flue gas SCR denitration technology, the caliber size that it is characterized in that described two-way nozzle is directly proportional with the average speed of each spray ammonia pipe installed position flue gas, each spray ammonia pipe is corresponding with two vertical whirlpool generating devices, two long direction eddy generator spacings are greater than vertical whirlpool generating device height of 3 times, vertically the width of whirlpool generating device is less than 1/2 flue width, and vertically the base length of whirlpool generating device is 0.5 times～2 times long direction eddy generator height.
The beneficial effect that the present invention compared with prior art has:
1) forms stable vertical whirlpool, improve the eddy current mixing intensity, optimize the ammonia nitrogen mixed effect;
2) reduced spray ammonia pipe quantity, reduced spray ammonia and regulated difficulty;
3) pressure drop that causes is less relatively, has reduced the loss of energy.
Description of drawings
Fig. 1 is the structural representation that is used for the ammonia spraying and mixing system of coal-fired flue gas SCR denitration technology;
Fig. 2 is the vertical view of structural representation of the present invention;
Fig. 3 is the side view of ammonia spraying and mixing system structural representation of the present invention;
Among the figure: reducing agent amonia adjutage 1, vertical whirlpool generating device 2, two-way nozzle 3.
The specific embodiment
As shown in the figure, the ammonia spraying and mixing system that is used for coal-fired flue gas SCR denitration technology comprises flue, reducing agent amonia adjutage 1, long direction eddy generator 2, two-way nozzle 3, in flue, be provided with by 5～20 reducing agent amonia adjutages 1, the end of every reducing agent amonia adjutage 1 is provided with two-way nozzle 3, the flue wall of the upstream and downstream of two-way nozzle 3 is provided with long direction eddy generator 2, long direction eddy generator 2 is to constitute by being fixed on vertical whirlpool generating device group that two on flue two walls rows arranges symmetrically, the vertical whirlpool of every row generating device group is made up of a plurality of vertical whirlpools generating device, and each vertical whirlpool generating device becomes 30 °～60 ° angles with flue gas flow direction.
Every reducing agent amonia adjutage 1 has independent flow control system.
Vertically the whirlpool generating device is shaped as triangle, trapezoidal, semicircle or half elliptic.
The spray ammonia mixing arrangement that is used for coal-fired flue gas SCR denitration technology is: the caliber size of two-way nozzle 3 is directly proportional with the average speed of each spray ammonia pipe 1 installed position flue gas, each spray ammonia pipe is corresponding with two vertical whirlpool generating devices, two long direction eddy generator 2 spacing L are greater than vertical whirlpool generating device 2 height H of 3 times, vertically the width L4 of whirlpool generating device 2 is less than 1/2 flue width A, and vertically the base length of whirlpool generating device 2 is 0.5 times～2 times long direction eddy generator height H.
Claims (4)
1. ammonia spraying and mixing system that is used for coal-fired flue gas SCR denitration technology, it is characterized in that comprising flue, reducing agent amonia adjutage (1), long direction eddy generator (2), two-way nozzle (3), in flue, be provided with by 5～20 reducing agent amonia adjutages (1), the end of every reducing agent amonia adjutage (1) is provided with two-way nozzle (3), the flue wall of the upstream and downstream of two-way nozzle (3) is provided with long direction eddy generator (2), long direction eddy generator (2) is to constitute by being fixed on vertical whirlpool generating device group that two on flue two walls rows arranges symmetrically, the vertical whirlpool of every row generating device group is made up of a plurality of vertical whirlpools generating device, and each vertical whirlpool generating device becomes 30 °～60 ° angles with flue gas flow direction.
2. a kind of ammonia spraying and mixing system that is used for coal-fired flue gas SCR denitration technology according to claim 1 is characterized in that described every reducing agent amonia adjutage (1) has independent flow control system.
3. a kind of ammonia spraying and mixing system that is used for coal-fired flue gas SCR denitration technology according to claim 1, what it is characterized in that described vertical whirlpool generating device is shaped as triangle, trapezoidal, semicircle or half elliptic.
4. a kind of ammonia spraying and mixing system that is used for coal-fired flue gas SCR denitration technology according to claim 1, the caliber size that it is characterized in that described two-way nozzle (3) is directly proportional with the average speed of each spray ammonia pipe (1) installed position flue gas, each spray ammonia pipe is corresponding with two vertical whirlpool generating devices, two long direction eddy generators (2) spacing greater than vertical whirlpool generating device (2) of 3 times highly, vertically the width of whirlpool generating device (2) is less than 1/2 flue width, and vertically the base length of whirlpool generating device (2) is 0.5 times～2 times long direction eddy generator height.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910153847A CN101708430A (en) | 2009-11-16 | 2009-11-16 | Ammonia spraying and mixing system for coal-fired flue gas SCR denitration technology |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910153847A CN101708430A (en) | 2009-11-16 | 2009-11-16 | Ammonia spraying and mixing system for coal-fired flue gas SCR denitration technology |
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| CN101708430A true CN101708430A (en) | 2010-05-19 |
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| CN200910153847A Pending CN101708430A (en) | 2009-11-16 | 2009-11-16 | Ammonia spraying and mixing system for coal-fired flue gas SCR denitration technology |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101856598A (en) * | 2010-05-28 | 2010-10-13 | 中电投远达环保工程有限公司 | Smoke gas mixing element and smoke gas denitration system |
| CN101987280A (en) * | 2010-11-24 | 2011-03-23 | 中国科学院广州能源研究所 | SCR (silicon controlled rectifier) denitration reactor of coal fuel gas |
| CN102580528A (en) * | 2012-02-09 | 2012-07-18 | 东南大学 | Blast cap type ammonia injection and mixing device for selective catalytic reduction denitration |
| CN103933858A (en) * | 2014-02-28 | 2014-07-23 | 东南大学 | Tangential double vortex SCR mixer |
| CN104524972A (en) * | 2014-12-22 | 2015-04-22 | 上海电气电站环保工程有限公司 | Design method of ammonia nozzle of SCR denitration device |
| CN106902660A (en) * | 2017-03-20 | 2017-06-30 | 北京清新环境技术股份有限公司 | A kind of ammonia jet mixing device for SCR Flue Gas Denitrification Engineerings |
| CN110469864A (en) * | 2019-08-08 | 2019-11-19 | 湖南大唐节能科技有限公司 | A kind of SCR subregion spray ammonia optimal control method of the preposition static mixer of band |
| CN116036818A (en) * | 2021-10-28 | 2023-05-02 | 中国石油化工股份有限公司 | Device and method for simultaneously desulfurizing and denitrating flue gas |
-
2009
- 2009-11-16 CN CN200910153847A patent/CN101708430A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101856598A (en) * | 2010-05-28 | 2010-10-13 | 中电投远达环保工程有限公司 | Smoke gas mixing element and smoke gas denitration system |
| CN101987280A (en) * | 2010-11-24 | 2011-03-23 | 中国科学院广州能源研究所 | SCR (silicon controlled rectifier) denitration reactor of coal fuel gas |
| CN102580528A (en) * | 2012-02-09 | 2012-07-18 | 东南大学 | Blast cap type ammonia injection and mixing device for selective catalytic reduction denitration |
| CN102580528B (en) * | 2012-02-09 | 2013-12-04 | 东南大学 | Blast cap type ammonia injection and mixing device for selective catalytic reduction denitration |
| CN103933858A (en) * | 2014-02-28 | 2014-07-23 | 东南大学 | Tangential double vortex SCR mixer |
| CN103933858B (en) * | 2014-02-28 | 2016-08-17 | 东南大学 | The double eddy current SCR blender of a kind of tangential |
| CN104524972A (en) * | 2014-12-22 | 2015-04-22 | 上海电气电站环保工程有限公司 | Design method of ammonia nozzle of SCR denitration device |
| CN106902660A (en) * | 2017-03-20 | 2017-06-30 | 北京清新环境技术股份有限公司 | A kind of ammonia jet mixing device for SCR Flue Gas Denitrification Engineerings |
| CN110469864A (en) * | 2019-08-08 | 2019-11-19 | 湖南大唐节能科技有限公司 | A kind of SCR subregion spray ammonia optimal control method of the preposition static mixer of band |
| CN116036818A (en) * | 2021-10-28 | 2023-05-02 | 中国石油化工股份有限公司 | Device and method for simultaneously desulfurizing and denitrating flue gas |
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Application publication date: 20100519 |